Miyagi Oysters with Serrano-Cucumber Granita

Plump, mild Miyagi oysters, which are grown along the coast of Marin County, pair perfectly with the cucumber granita, which both cools the palate and keeps the oysters chilled. It is always best to eat oysters the same day as purchase, or at least within a couple of days of purchase. Live oysters smell fresh, sweet, and briny and have tightly closed shells. Lightly tap any oyster with an open shell; if it snaps shut immediately, it’s good.